Modify file displayed in AxSHDocVw.AXWebBrowser

I have an issue with the webbrowser control (AxSHDocVw.AXWebBrowser).
The webbrowser control contains an html page loaded from local disk. However when I try to modify the html file (in Notepad or whatever) I get this error:
"The process cannot access the file because it is being used by another process."

How can I modify the html file while it is in the web browser control??
Thanks

I'm no expert on security, but I dont think that it. I've been trying many folders that I use regularly, as well as new test folders.
The original htm file was created manually. I've since also tried creating and reloading the file programatically from the actual application itself.
I am only able to save the htm file when I stop debugging.

Hang on - I've found the problem - I still dont know how to resolve it though..

Another piece of code is running in the same sub that loads the htm file. When I comment it out it works. So it looks like the commented code (below) is still keeping the file/stream open.
How do I close the stream?

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